title: 1-Methyl-3-(2-oxo-2H-chromen-3-yl)-1H-imidazol-3-ium picrate.
abstract: The title salt, C13H11N2O2 (+)·C6H2N3O7 (-), is the unexpected product of a domino reaction of 3-cyano-methyl-1-methyl-imidazolium chloride with salicylic aldehyde in the presence of picric acid. In the cation, the 1H-imidazole ring is twisted by 63.2 (1)° from the 2H-chromen plane. In the crystal, cations and anions are alternately stacked along the a axis through π-π stacking inter-actions between the almost parallel aromatic rings [centroid-centroid distances = 3.458 (2) and 3.678 (2) Å]. The stacks are further linked by C-H⋯O hydrogen bonds into a two-tier layer parallel to (001).
authors.affiliation: Institute of Chemistry, Vietnam Academy of Science & Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
authors.forename: Nguyen Van
authors.initials: NV
authors.lastname: Tuyen
authors.forename: Le Tuan
authors.initials: le T
authors.lastname: Anh
authors.forename: Alexey A
authors.initials: AA
authors.lastname: Festa
authors.forename: Leonid G
authors.initials: LG
authors.lastname: Voskressensky
authors.forename: Victor N
authors.initials: VN
authors.lastname: Khrustalev